1.
1.
PREFACE
PREFACE
1.1 Features
1.1 Features
HSD INTERFACE (NQA-1951A) is interface between ISDN equipment with S/T-interface or Personal Com-
HSD INTERFACE (NQA-1951A) is interface between ISDN equipment with S/T-interface or Personal Com-
puter (PC) with RS232 interface and HSD-port on JUE-300B or JUE-310B.
puter (PC) with RS232 interface and HSD-port on JUE-300B or JUE-310B.
1.1.1 Communication with ISDN equipment
1.1.1 Communication with ISDN equipment
NQA-1951A is capable of HSD 64kbps Communication with ISDN equipment conforming to Basic-rate-
NQA-1951A is capable of HSD 64kbps Communication with ISDN equipment conforming to Basic-rate-
ISDN-service known as 2B+D*1, provides two 64Kbps (B) data channels and one 16Kbps (D) signalling
ISDN-service known as 2B+D*1, provides two 64Kbps (B) data channels and one 16Kbps (D) signalling
channel, such as Video telephony and ISDN router.
channel, such as Video telephony and ISDN router.
1.1.2 PC to PC communication
1.1.2 PC to PC communication
NQA-1951A is capable of point to point communication using terminal communication software.
NQA-1951A is capable of point to point communication using terminal communication software.
V.120 protocol used to interface PC with HSD-port is communication protocol to convert synchronous
V.120 protocol used to interface PC with HSD-port is communication protocol to convert synchronous
mode to asynchronous mode.
mode to asynchronous mode.
NQA-1951A installed on a board communicates with another NQA-1951A or the Terminal Adapter (TA)
NQA-1951A installed on a board communicates with another NQA-1951A or the Terminal Adapter (TA)
using V.120 protocol installed over ISDN line.
using V.120 protocol installed over ISDN line.
Dialing and answering is controlled with specific AT commands.
Dialing and answering is controlled with specific AT commands.
1.1.3 Internet accessing
1.1.3 Internet accessing
NQA-1951A is capable of accessing to Internet Service Provider (ISP) with Windows Dial-up Networking
NQA-1951A is capable of accessing to Internet Service Provider (ISP) with Windows Dial-up Networking
with PPP protocol . The device driver software*2 attached to NQA-1951A should be installed in Microsoft
with PPP protocol . The device driver software*2 attached to NQA-1951A should be installed in Microsoft
Windows to use Microsoft Windows Dial-up Networking.
Windows to use Microsoft Windows Dial-up Networking.
*1 : Inmarsat HSD service operates on a single B-channel.
*1 : Inmarsat HSD service operates on a single B-channel.
*2 : The device driver software are saved in floppy disk attached to NQA-1951A for Windows 95/98/NT.
*2 : The device driver software are saved in floppy disk attached to NQA-1951A for Windows 95/98/NT.
